CN105369190B - A kind of dry cyaniding automation control method and device - Google Patents
A kind of dry cyaniding automation control method and device Download PDFInfo
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- CN105369190B CN105369190B CN201510910528.7A CN201510910528A CN105369190B CN 105369190 B CN105369190 B CN 105369190B CN 201510910528 A CN201510910528 A CN 201510910528A CN 105369190 B CN105369190 B CN 105369190B
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C8/00—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals
- C23C8/06—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases
- C23C8/28—Solid state diffusion of only non-metal elements into metallic material surfaces; Chemical surface treatment of metallic material by reaction of the surface with a reactive gas, leaving reaction products of surface material in the coating, e.g. conversion coatings, passivation of metals using gases more than one element being applied in one step
- C23C8/30—Carbo-nitriding
- C23C8/32—Carbo-nitriding of ferrous surfaces
Abstract
The invention discloses a kind of dry cyaniding automation control method and device, the equipment includes nitriding furnace 1 and PLC, pressure sensor, HydroNit sensor, thermocouple, blade, blower fan, heating temperature control means, the grade device of exhaust apparatus 9, part passes through degreasing, cleaning, pass through vavuum pump after surface treatment in stove, nitrogen, ammonia, ethanol and temperature, the closed loop feedback control of pressure is completed to high-speed steel, the tufftride of all kinds of conventional nitridation steel such as stainless steel, efficient energy-saving of the present invention, easy care, it is pollution-free, product quality performance is high, quickly established for the quantity of corresponding part and the technological parameter of material using PLC control system, control the nitride layer, white layer of part, netted layer depth is stable, stainless steel batch production uniformity is stable, the small power consumption of ammonia consumption is low, the few efficiency high of nitridation time.
Description
Technical field
A kind of the dry cyaniding automation control method and device of the present invention, belong to dry cyaniding technology neck
Domain.
Background technology
Nitrocarburizing is based on nitriding while penetrates into the chemical heat treatment process of carbon, also referred to as tufftride, main purpose
Be improve steel wearability and seizure resistance to meet the requirement of product quality.In tufftride industry, enterprise, which is constantly pursued, to be had
More excellent production technology, higher-quality nitridation product and the more perfect production control method of automaticity and device are to subtract
Few cost of labor, human error and increase technology stability are reduced, increase product quality and improve production efficiency etc..
Existing nitrocarburizing technology is broadly divided into that liquid processes and gas method be i.e. bath nitriding and gas soft nitriding, because at present
The salt-bath nitriding of liquid processes has that nitridation process is cumbersome, and reaction product is poisonous, enterprise is high to treatment cost of waste liquor, waste material environment is dirty
The shortcomings such as dye is big, efficiency of nitridation is low so industry is just being phased out liquid processes salt-bath nitriding, gas soft nitriding be substantially exactly
Under cryogenic conditions, the low-temperature nitrocarburizing based on nitriding, make carbon and nitrogen while penetrate into a kind of thermo-chemical treatment of steel surface.Its
Middle nitriding provides nitrogen-atoms using ammonia, and carburizing provides carbon using CO or ethanol etc., chlorion is utilized in nitriding process
Passivation film on stainless steel surface is destroyed, its feature is that treatment temperature is low, not limited and processing time is short by steel grade, and workpiece deformation is small,
Steady quality, the performances such as the wearability of part, fatigue strength, bite-resistant, anti scuffing can be significantly improved.
At present in terms of gas soft nitriding, the country is mainly used in the tufftride of high-speed steel, and stainless steel gas soft nitriding is not yet
Popularization, mainly due to technology is immature, nitridation stability difference and conventional gas tufftride is of long duration, efficiency is low and high-volume not
The shortcomings such as rust steel gas soft nitriding is uneven, qualification rate is low.Comprehensive landscape, gas soft nitriding, which at home and abroad mainly divides, height
In low tri-layer.Respectively low level：Using artificial whole control manually, the GN 2 carbon is completed according to time control and experience
Permeation, causes that efficiency of nitridation is low, ammonia consumption is big, product quality stability deficiency, can not just for the tufftride of high-speed steel
The tufftride to stainless steel is realized, percent defective is high, and worker troublesome in poeration cultivates the shortcomings of difficult；It is middle-level：The country more generally uses
Low automation or semi-automatic control scheme, sampling gas is detected with stove outer sensor and reaches semiclosed loop control to ethanol and ammonia
System, shortcoming is that control accuracy is low, and live signal hysteresis is big compared with stably nitriding process parameter and ammonia consumption is seldom gone out, and can be achieved
High-speed steel tufftride is difficult to the uniform tufftride of high-volume stainless steel.Wherein such as：China Patent Publication No.
It is manual or Semi-automatic control system process equipment used in CN102517541A, the process equipment manual control is stable
Property it is poor, labor intensity is big, and manual control efficiency is low and nitridation time is grown, and nitridation ammonia usage is big.It is high-level：That is Automatic Control
Tufftride, it is divided to two kinds of home and overseas, using external high-precision detection sensor and the equipment of a full set of control system, shortcoming is cost
Too high, system is cumbersome, and Maintenance Difficulty, maintenance cost are high, and domestic manufacturer is the ground zero stage to this level at present, technology not great achievement
It is ripe, have and produce using carbon monoxide as the complete closed-loop control tufftride of horizontal chamber furnace (oven) for providing carbon atom, but visited using import hydrogen-oxygen
Head, cost is high, and ammonia consumption is big, and nitridation time is long and can not solve the intensive finding of multilayer（Such as air conditioner compressed machine part
Slide plate）Nitridation infiltration layer homogeneity question, so existing gas soft nitriding automation control method and device are still not perfect enough.
The content of the invention
The present invention goal of the invention be：A kind of simple in construction, safe and reliable, efficient energy-saving, easy care are provided, it is pollution-free,
Product quality performance is high, is quickly established, controlled for the quantity of corresponding part and the technological parameter of material using PLC control system
The nitride layer, white layer of part, netted layer depth are stable, and stainless steel batch production uniformity is stable, and the small power consumption of ammonia consumption is low, nitridation
A kind of the dry cyaniding automation control method and device of time few efficiency high, with overcome the deficiencies in the prior art.
What the present invention was realized in：A kind of dry cyaniding automatic control device, including nitriding furnace, PLC control
Device, heating temperature control means, ammonia drying equipment and touch-screen, pressure sensor, HydroNit sensor, thermoelectricity are provided with the nitriding furnace
Even summation electric furnace heating wire, blade is provided with the top of nitriding furnace, blade is connected with blower fan, the heating temperature control means and thermocouple and
Electric furnace heating wire is connected, and the nitriding furnace is connected by vacuum pipe with vavuum pump, and the nitriding furnace passes through discharge duct and row
Device of air is connected, the blower fan, pressure sensor, HydroNit sensor, heating temperature control means, exhaust apparatus and vavuum pump respectively with
PLC is connected；The nitridation furnace bottom is connected to nitrogen pipeline, ethanol pipeline and ammonia pipeline；The exhaust
Device is connected with liquefaction tracheae.
Hydrogen analyzer is provided between the HydroNit sensor and PLC；Vacuum pipe is provided with the vacuum pipe
Valve, drain tap and exhaust solenoid valve are provided with the discharge duct.
Nitrogen magnetic valve is provided with the nitrogen pipeline, ethanol magnetic valve and three pins drop are provided with the ethanol pipeline
Degree is counted, and constant regulating valve and control adjustable valve and ammonia flow gauge are provided with the ammonia pipeline.
Ammonia drying equipment is provided with the ammonia pipeline, dew point hygrometer is provided with ammonia drying equipment.
Igniter is provided with the exhaust apparatus.
Ammonia flow gauge is provided with ammonia pipeline.
Liquefied gas magnetic valve is provided with liquefaction tracheae.
A kind of control method of dry cyaniding automatic control device, the control method are carried out according to the following steps：
1）Forvacuum：Nitridation furnace door is opened, fire door is closed after putting into part, after closing drain tap, opens vacuum
Pump, blower fan and heating temperature control means are opened, vavuum pump is closed when being evacuated to 20~35pa of vacuum of setting；
2）Protect gas filling：Nitrogen magnetic valve is passed through in nitrogen to stove after opening reaches malleation, and pressure value is 5~20 centimetres
Exhaust solenoid valve is opened during water column, regulation exhaust solenoid valve capacity maintaining nitrogen purge to furnace pressure is 15~45 centimeter water columns, is protected
Exhaust valve opening is incrementally increased after holding 3~8 minutes reduces pressure to 0~15 centimeter water column；
3）Raw material adds：Start the motor of rotating vane, when the furnace temperature of nitriding furnace rises to 120 DEG C~250 DEG C, open ethanol
Magnetic valve, it is passed through except entering after passivating film ethanol solution to three pin titre meters in stove, three pin titres is adjusted by nitriding process requirement
Meter control drop speed, keeping logical nitrogen, stopping is passed through nitrogen ammonia simultaneously to furnace temperature up to nitrogen magnetic valve is closed after 250 DEG C~400 DEG C
Drying equipment starts, dew point hygrometer detection ammonia drying values, there is provided dry ammonia, constant regulating valve and control adjustable valve are beaten simultaneously
Open, adjusting exhaust solenoid valve or drain tap makes controling of the pressure of the oven in setting value, hydrogen analyzer monitoring ammonia dissociation rate, when actual ammonia point
When solution rate reaches the ammonia dissociation rate setting value of PLC setting, control adjustable valve controls automatically into high frequency break-make, flow
The total flow of meter monitoring ammonia；
4）Exhaust-gas treatment：When the furnace temperature of nitriding furnace reaches 400 DEG C~500 DEG C, liquefied gas magnetic valve is opened, is passed through liquefied gas
To exhaust apparatus, ignition device, using the combustion-supporting waste gas of liquefied gas sustained combustion, to stove in reach the setting of 15%~45% section
Ammonia dissociation rate liquefied gas closed electromagnetic valve when being the stable ammonia dissociation rate of waste gas burning, stop combustion-supporting；
5）Insulation nitridation：Nitriding furnace continues to heat up, and the furnace temperature of nitriding furnace enters nitridation insulation when reaching 560 DEG C~580 DEG C
Stage, insulation timing start, and 180~300min of soaking time, pressure enters closed-loop control, controls in 10~28 centimeter water columns,
Single hop or three sections of ammonia dissociation rates are set, realize that the total time of stainless steel slide plate tufftride is less than 300min；
6）Cooling is come out of the stove：After soaking time terminates, constant regulating valve and control adjustable valve simultaneously close off, ethanol magnetic valve
Close, blower fan is closed, heating is closed, nitrogen magnetic valve, which is opened, makes the furnace temperature of nitriding furnace be cooled to less than 280 DEG C, door opened,
Product is come out of the stove.
The constant regulating valve and control adjustable valve total flow be 2~4 m3/h, PLC record ammonia dissociation rate with
Ammonia flow time graph.
Using this kind of dry cyaniding automation control method and device to 11Cr17 stainless steels（It is stainless with 11Cr17
Exemplified by steel）5 batch gas nitrocarburizing processing are carried out, each experimentai batches number of parts is 5040, and 5 experiments are tested altogether
Part sum is 25200, is below the examples measure result of five batch parts.
By adopting the above-described technical solution, during present invention work, by the above method, it can complete stainless steel slide plate（With
Exemplified by 11Cr17 stainless steel slide plates）Single batch is more than 5000, and ammonia flow is less than 4 m3/h, and the nitridation used time is less than
Hardness is more than 900HV at 300min, product 30um, and hardness is more than 600HV at 60um, and nitride layer, white layer is more than 5um, and lamina reticularis is more than
80um, qualification rate are more than 99.5%, and system equipment emphasis realizes the nitrogen of the intensive stainless steel thin slice part of multilayer compared with both at home and abroad
Change that infiltration layer is uniform, and gas raw material consumption is low, the big efficiency of nitridation of single batch is high, nitridation used time few four major problem.
Brief description of the drawings
Fig. 1 is the structural representation of the present invention；
Fig. 2 is the system control process block diagram of the present invention；
Description of reference numerals：1- nitriding furnaces, 2-PLC controllers, 3- HydroNit sensors, 4- thermocouples, 5- blades, 6- blower fans, 7-
Heating temperature control means, 8- pressure sensors, 9- exhaust apparatus, 10- vavuum pumps, 11- vacuum pipes, 12- hydrogen analyzers, 13- rows
Air valve, 14- discharge ducts, 15- vacuum pipe valves, 16- nitrogen pipelines, 17- ethanol pipelines, 18- ammonia pipelines, 19- nitrogen
Pneumoelectric magnet valve, 20- ethanol magnetic valves, 21- constant regulating valves, 22- control adjustable valves, the pin titre meters of 23- tri-, 24- ammonias are done
Dry equipment, 25- dew point hygrometers, 26- liquefaction tracheaes, 27- igniters, 28- ammonia flow gauge, 29- liquefied gas magnetic valves, 30- rows
Pneumoelectric magnet valve, 31- electric furnace heating wires, 32- touch-screens.
Embodiment
The present invention is described in further detail with reference to the accompanying drawings and examples, but not as the limit to the present invention
System.
Embodiments of the invention：A kind of dry cyaniding automatic control device, including nitriding furnace 1, PLC 2,
Heating temperature control means 7, ammonia drying equipment 24 and touch-screen 32, pressure sensor 8, HydroNit sensor are provided with the nitriding furnace 1
3rd, thermocouple 4 and electric furnace heating wire 31, the top of nitriding furnace 1 is provided with blade 5, blade 5 is connected with blower fan 6, the heating temperature control
Device 7 is connected with thermocouple 4 and electric furnace heating wire 31, and the nitriding furnace 1 is connected by vacuum pipe 11 with vavuum pump 10, described
Nitriding furnace 1 is connected by discharge duct 14 with exhaust apparatus 9, the blower fan 6, pressure sensor 8, HydroNit sensor 3, heating temperature control
Device 7, exhaust apparatus 9 and vavuum pump 10 are connected with PLC 2 respectively；The bottom of nitriding furnace 1 is connected to nitrogen
Feed channel 16, ethanol pipeline 17 and ammonia pipeline 18；The exhaust apparatus 9 is connected with liquefaction tracheae 26.
Hydrogen analyzer 12 is provided between the HydroNit sensor 3 and PLC 2；It is provided with the vacuum pipe 11 true
Vacant duct valve 15, drain tap 13 and exhaust solenoid valve 30 are provided with the discharge duct 14.
Nitrogen magnetic valve 19 is provided with the nitrogen pipeline 16, ethanol magnetic valve 20 is provided with the ethanol pipeline 17
With three pin titre meters 23, constant regulating valve 21 and control adjustable valve 22 and ammonia flow gauge are provided with the ammonia pipeline 18
28。
Ammonia drying equipment 24 is provided with the ammonia pipeline 18, dew point hygrometer is provided with ammonia drying equipment 24
25。
Igniter 27 is provided with the exhaust apparatus 9.
Ammonia flow gauge 28 is provided with ammonia pipeline 18.
Liquefied gas magnetic valve 29 is provided with liquefaction tracheae 26.
A kind of control method of dry cyaniding automatic control device, the control method are carried out according to the following steps：
1）Forvacuum：Nitridation furnace door is opened, fire door is closed after putting into part, after closing drain tap, opens vacuum
Pump, blower fan and heating temperature control means are opened, vavuum pump is closed when being evacuated to 20~35pa of vacuum of setting；
2）Protect gas filling：Nitrogen magnetic valve is passed through in nitrogen to stove after opening reaches malleation, and pressure value is 5~20 centimetres
Exhaust solenoid valve is opened during water column, regulation exhaust solenoid valve capacity maintaining nitrogen purge to furnace pressure is 15~45 centimeter water columns, is protected
Exhaust valve opening is incrementally increased after holding 3~8 minutes reduces pressure to 0~15 centimeter water column；
3）Raw material adds：Start the motor of rotating vane, when the furnace temperature of nitriding furnace rises to 120 DEG C~250 DEG C, open ethanol
Magnetic valve, it is passed through except entering after passivating film ethanol solution to three pin titre meters in stove, three pin titres is adjusted by nitriding process requirement
Meter control drop speed, keeping logical nitrogen, stopping is passed through nitrogen ammonia simultaneously to furnace temperature up to nitrogen magnetic valve is closed after 250 DEG C~400 DEG C
Drying equipment starts, dew point hygrometer detection ammonia drying values, there is provided dry ammonia, constant regulating valve and control adjustable valve are beaten simultaneously
Open, adjusting exhaust solenoid valve or drain tap makes controling of the pressure of the oven in setting value, hydrogen analyzer monitoring ammonia dissociation rate, when actual ammonia point
When solution rate reaches the ammonia dissociation rate setting value of PLC setting, control adjustable valve controls automatically into high frequency break-make, flow
The total flow of meter monitoring ammonia；
4）Exhaust-gas treatment：When the furnace temperature of nitriding furnace reaches 400 DEG C~500 DEG C, liquefied gas magnetic valve is opened, is passed through liquefied gas
To exhaust apparatus, ignition device, using the combustion-supporting waste gas of liquefied gas sustained combustion, to stove in reach the setting of 15%~45% section
Ammonia dissociation rate liquefied gas closed electromagnetic valve when being the stable ammonia dissociation rate of waste gas burning, stop combustion-supporting；
5）Insulation nitridation：Nitriding furnace continues to heat up, and the furnace temperature of nitriding furnace enters nitridation insulation when reaching 560 DEG C~580 DEG C
Stage, insulation timing start, and 180~300min of soaking time, pressure enters closed-loop control, controls in 10~28 centimeter water columns,
Single hop or three sections of ammonia dissociation rates are set, realize that the total time of stainless steel slide plate tufftride is less than 300min；
6）Cooling is come out of the stove：After soaking time terminates, constant regulating valve and control adjustable valve simultaneously close off, ethanol magnetic valve
Close, blower fan is closed, heating is closed, nitrogen magnetic valve, which is opened, makes the furnace temperature of nitriding furnace be cooled to less than 280 DEG C, door opened,
Product is come out of the stove.
The constant regulating valve and control adjustable valve total flow be 2~4 m3/h, PLC record ammonia dissociation rate with
Ammonia flow time graph.
The thermocouple 4 divides for upper thermocouple and bottom thermocouple, is respectively used to detect upper of furnace body and the temperature of bottom
Degree situation, when the temperature of detection is transmitted to heating temperature control means 7 in time, electric furnace heating wire 31 is being controlled to carry out stove by heating temperature control means 7
Body is heated, and heating temperature control means are controlled by PLC simultaneously and signal is fed back to PLC.
The pollution of the traditional tufftride of present invention solution is greatly, energy consumption is big, efficiency is low, manual or semiautomatic control gas nitriding
The situations such as inhomogeneities and solution traditional gas tufftride batch are low, complete single shove charge and be more than 5000 compressors of air conditioner cunnings
The intensive stainless steel batch gas soft nitriding of multilayer of piece, realize the efficient tufftride of stainless steel parts batch.The equipment includes nitridation
Stove 1 and PLC 2, pressure sensor 8, HydroNit sensor 3, thermocouple 4, blade 5, blower fan 6, heating temperature control means 7, exhaust dress
9 grade devices are put, part in stove after degreasing, cleaning, surface treatment by passing through vavuum pump 10, nitrogen, ammonia, ethanol and temperature
Degree, the closed loop feedback control of pressure complete the tufftride of conventional nitridation steel all kinds of to high-speed steel, stainless steel etc..
Each control parameter of the present invention can be shown and monitor on the touchscreen in real time, and parameters history record can be checked and preserved
And call parameters, data comparison, adjustment can be realized to the tufftride of new material, technological parameter is quickly determined, to having determined work
The nitride material of skill can directly invoke PLC 2 preservation technological parameter, preserve technological parameter quantity up to 1000 with
On, the total depth of penetration of its nitridation product, nitride layer, white layer, lamina reticularis and part nitridation uniformity reach perfect condition；By to nitrogen
Part surface preparation and to gas stream in the stove hydrodynamics finite element analysis before change, make the intensive finding nitridation of multilayer uneven and
The situations such as efficiency of nitridation is low are addressed, and the nitridation infiltration layer that equipment emphasis realizes the intensive stainless steel thin slice part of multilayer is uniform,
Gas raw material consumption is low, and the big efficiency of nitridation of single batch is high, nitridation used time few four major problem.
Claims (9)
1. a kind of dry cyaniding automatic control device, including nitriding furnace（1）, PLC（2）, heating temperature control means
（7）, ammonia drying equipment（24）And touch-screen（32）, it is characterised in that：The nitriding furnace（1）On be provided with pressure sensor
（8）, HydroNit sensor（3）, thermocouple（4）And electric furnace heating wire（31）, in nitriding furnace（1）Top is provided with blade（5）, blade（5）And wind
Machine（6）It is connected, the heating temperature control means（7）With thermocouple（4）And electric furnace heating wire（31）It is connected, the nitriding furnace（1）It is logical
Cross vacuum pipe（11）With vavuum pump（10）It is connected, the nitriding furnace（1）Pass through discharge duct（14）With exhaust apparatus（9）Phase
Connection, the blower fan（6）, pressure sensor（8）, HydroNit sensor（3）, heating temperature control means（7）, exhaust apparatus（9）And vacuum
Pump（10）Respectively with PLC（2）It is connected；The nitriding furnace（1）Bottom is connected to nitrogen pipeline（16）, ethanol pipe
Road（17）With ammonia pipeline（18）；The exhaust apparatus（9）With the tracheae that liquefies（26）It is connected.
2. dry cyaniding automatic control device according to claim 1, it is characterised in that：The HydroNit sensor（3）
With PLC（2）Between be provided with hydrogen analyzer（12）；The vacuum pipe（11）On be provided with vacuum pipe valve
（15）, the discharge duct（14）On be provided with drain tap（13）And exhaust solenoid valve（30）.
3. dry cyaniding automatic control device according to claim 1, it is characterised in that：The nitrogen pipeline
（16）On be provided with nitrogen magnetic valve（19）, the ethanol pipeline（17）On be provided with ethanol magnetic valve（20）With three pin titre meters
（23）, the ammonia pipeline（18）On be provided with constant regulating valve（21）With control adjustable valve（22）With ammonia flow gauge
（28）.
4. dry cyaniding automatic control device according to claim 3, it is characterised in that：The ammonia pipeline
（18）On be provided with ammonia drying equipment（24）, in ammonia drying equipment（24）On be provided with dew point hygrometer（25）.
5. dry cyaniding automatic control device according to claim 1, it is characterised in that：The exhaust apparatus
（9）On be provided with igniter（27）.
6. dry cyaniding automatic control device according to claim 1, it is characterised in that：In ammonia pipeline（18）
On be provided with ammonia flow gauge（28）.
7. dry cyaniding automatic control device according to claim 1, it is characterised in that：In liquefaction tracheae（26）
On be provided with liquefied gas magnetic valve（29）.
A kind of 8. controlling party of dry cyaniding automatic control device as described in claim 1~7 any claim
Method, it is characterised in that：The control method is carried out according to the following steps：
1）Forvacuum：Nitridation furnace door is opened, fire door is closed after putting into part, after closing drain tap, vavuum pump is opened, opens
Blower fan and heating temperature control means are opened, vavuum pump is closed when being evacuated to 20~35pa of vacuum of setting；
2）Protect gas filling：Nitrogen magnetic valve is passed through in nitrogen to stove after opening reaches malleation, and pressure value is 5~20 centimeter water columns
When open exhaust solenoid valve, regulation exhaust solenoid valve capacity maintaining nitrogen purge to furnace pressure be 15~45 centimeter water columns, holding 3
Exhaust valve opening is incrementally increased after~8 minutes reduces pressure to 0~15 centimeter water column；
3）Raw material adds：Start the motor of rotating vane, when the furnace temperature of nitriding furnace rises to 120 DEG C~250 DEG C, open ethanol electromagnetism
Valve, it is passed through except entering after passivating film ethanol solution to three pin titre meters in stove, is controlled based on nitriding process requirement three pin titres of regulation
System drop speed, keeping logical nitrogen, stopping is passed through nitrogen, and ammonia is dried simultaneously to furnace temperature up to nitrogen magnetic valve is closed after 250 DEG C~400 DEG C
Equipment starts, dew point hygrometer detection ammonia drying values, there is provided and dry ammonia, constant regulating valve and control adjustable valve are opened simultaneously,
Regulation exhaust solenoid valve or drain tap make controling of the pressure of the oven in setting value, hydrogen analyzer monitoring ammonia dissociation rate, when actual ammonolysis craft
When rate reaches the ammonia dissociation rate setting value of PLC setting, control adjustable valve controls automatically into high frequency break-make, flowmeter
Monitor the total flow of ammonia；
4）Exhaust-gas treatment：When the furnace temperature of nitriding furnace reaches 400 DEG C~500 DEG C, liquefied gas magnetic valve is opened, is passed through liquefied gas to row
Device of air, ignition device, using the combustion-supporting waste gas of liquefied gas sustained combustion, to stove in reach the ammonia of 15%~45% section setting
Liquefied gas closed electromagnetic valve when resolution ratio is waste gas burning stable ammonia dissociation rate, stops combustion-supporting；
5）Insulation nitridation：Nitriding furnace continues to heat up, and the furnace temperature of nitriding furnace enters nitridation holding stage when reaching 560 DEG C~580 DEG C,
Insulation timing starts, and 180~300min of soaking time, pressure enters closed-loop control, controls single in 10~28 centimeter water columns, setting
Section or three sections of ammonia dissociation rates, realize that the total time of stainless steel slide plate tufftride is less than 300min；
6）Cooling is come out of the stove：After soaking time terminates, constant regulating valve and control adjustable valve simultaneously close off, and ethanol magnetic valve closes
Close, blower fan is closed, heating is closed, nitrogen magnetic valve, which is opened, makes the furnace temperature of nitriding furnace be cooled to less than 280 DEG C, door opened, produces
Product are come out of the stove.
9. the control method of dry cyaniding automatic control device according to claim 8, it is characterised in that：It is described
Constant regulating valve and control adjustable valve total flow be 2~4 m3/h, PLC records ammonia dissociation rate and ammonia flow time song
Line.
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| CN107574405A (en) * | 2017-08-30 | 2018-01-12 | 江苏密斯欧智能科技有限公司 | A kind of nitriding control system |
| CN108169277A (en) * | 2017-12-25 | 2018-06-15 | 中国航发动力股份有限公司 | A kind of calibration equipment and its method of calibration of ammonia gas in nitridation furnace resolution ratio |
| CN108754404A (en) * | 2018-08-15 | 2018-11-06 | 惠德捷（北京）科技有限公司 | The energy saving and environment friendly automation vacuum of one kind, carbonization, nitridation heat treatment integrated equipment stove |
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|---|---|---|---|---|
| JP2931173B2 (en) * | 1993-01-22 | 1999-08-09 | 株式会社ライムズ | Ion nitriding of metal members |
| CN2729089Y (en) * | 2004-08-02 | 2005-09-28 | 西南交通大学材料科学与工程学院 | Gas multielement common disffusion control system |
| CN205241776U (en) * | 2015-12-10 | 2016-05-18 | 贵州西南工具(集团)有限公司 | Dry cyaniding automated control device |
-
2015
- 2015-12-10 CN CN201510910528.7A patent/CN105369190B/en active Active
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